haskell king



(Model.)

W. H. KING.

Bolt.

Patented May 24, 1881..l

UNITED STATES PATENT OFFICE.

W. HASKELL KING, OF ATEIOL, MASSACHUSETTS.

B O LT SPECIFICATION forming part of Lettere Patent No. 241,998, deseaMey 24, 1881.

Application filed April 6,1881.

To all whom fitmay concern:

Be it known that I, W. HASKELL KING, a citizen of the United States,residing at Athol, in the county of Worcester and State ofMassachusetts, have invented new and useful Imprcvem ents in Door-Bolts,of which the following is a specification.

The object of my invention is to simplify the construction of mortisedoor-bolts, to render them stron g and durable, and to lock the bolt inits positions of projection and retraction, so that it cannot be movedtherefrom except by the use of a suitable key.

y In the accompanying drawings, Figure l is a view, in elevation,ofmyimproved door-bolt. Fig. 2 is a similar view, the front portion of thecase being removed andthe boltprojected. Fig. 3 is a longitudinalsection on the line w x of Fig. 1. Fig. 4 is an edge view of thecrankdog detached. Fig. 5 is a view ofthe key and escutcheon.

The letter A denotes the case, made of two semi-cylindrical parts,o anda,the part a having secured to its front end an annular vfaceplate, aZ,behind which the front end of the'part c sets.

B designates the cylindrical holt, resting in the part a, and adapted toplay longitudinally in the case. The rearportion,B/,of the boltis cutaway on one side to about half the thickness of the front part, forminga flat front face, across and near therear end of which is formed astraight groove, b. Through the boltis formed parts of the case areplaced together the hub d' of the crank-arm enters acorrespondinglyshaped aperture-or hearing, d2, form ed through thewallet part c of said casing, so that a suitable key may he inserted inthe socket di of the huh, which socket maybe squared, as shown,

(Model.)

or otherwise formed to embrace a corresponding' key and prevent said keyfrom turning without also turning the hub. The socket is preferablyclosed at its inner end, and thus dust will be prevented from enteringthe case, as the hub and holt will fit snugly in their bearings. Thecenter of the hub, in its bearing, stands above the center line of thecasing and bolt, andthe crank-arm is of such length that it can performa'little more than a half-revolution in the direction of the arrows,Fig. 2, and its crank-pin strikes the wall of the casing immediatelyafter it rises above the centerline in its movement in both directions.

When the parts are secured in position, as shown in Fig. l, a keysay,such as is shown in Fig. -has its squared tip inserted in the hubd', and by turning said key forward the crank-arm is thrown forward tothe limit of its movement-thatis, with its crank-pin against the upperpart of the casing and a little above its own dead-center line. Thismovement of the crank throws the bolt out, of course, the crank-pinplaying in groove b. The crank-arm in this position acts asa dog toprevent theretraction of the bolt except by the turning of the key inthe opposite direction, for it is obvious that any rearward pressureupon the bolt would tend only to revolve the crank in the same directionit followed in throwing the bolt out; but in this direction it cannotmove farther, because its pin d is stopped by the wall of the case. Byturning the key rearward the holt is retracted and the crank-arm carriedto its rearward limit, as shown'in dotted lines, Fig. Z-that is, to aposition the reverse of that shown in full lines-and its pin stopped bythe upper wall of the case.

I have shown, simply for greater security, the crank-arm as making alittle more than a half -revolution and rising a little above itsdead-center line in projecting the bolt; but it is obvious that it' itwere stopped directly upon its dead-center line, which coincides withthe center line of the bolt, the bolt could not be pushed in orotherwise retracted than by akey. I do not, therefore, confine myself tomoving the crank above its dead-center.

To give steadiness and smoothness of Inotion to the bolt, and to obviaterattling when the bolt is used on the door of vehicles,a bowspring, f,isarranged behindv the bolt, between it and the wall ot' the case, andpresses the bolt forward snugly to `its bearings.

I am aware that cranks have been used to operate bolts, and I do not,broadly, claim the combination ot a crank and bolt operated thereby.

What I claim isl. Amortise door-boltcoinbinin g in its structure aninelosing-casin g, a sliding boltarranged therein, and provided at ornear its rear end with a groove extending transversely across the bolt,and the crank-arm constructed to receive a key, and having a crank-pinarranged to playin the transverse groove across the bolt, and to makenot less than ahalf-revolution between two points on opposite sides ofits axis, and stops to limit the movement or" the crankpiu in bothdirections, substantially as described, whereby the crank serves both tooperate and to dog the bolt, as setl forth.

2. A mortise door-bolt combining in its structure the inclosing-casing,the sliding bolt arranged therein, and having at or near its rear end agroove extending transversely across the bolt, and the crank-arm havingon one side a crank-pin arranged to playin the groove across the bolt,and on its other side a hub passing 3o through a bearin gin the wallofthe casing, and provided with a socket to receive a key, substantiallyas described.

In testimony whereofI have hereunto set my hand in the presence of twosubscribing witnesses.

W. HASKELL KING.

Witnesses:

JAMES L. NoRRIs, J. A. RUTHERFORD.

